in. the way i explain it, i listened to an interview in russian of his kindergarten teacher, tamerlan's teacher, she said the family was wonderful, good people, but when he came to preschool, he had come out of the first chechnyan war, and he was very sensitive to fire crackers and loud noises, and she attributed that to war trauma. so i from the beginning, does tamerlan have ptsd? then during the second chechnyan war the father had lost his job, then he came here. tamerlan didn't come right in the beginning. so he had a lot of moves, a lot of difficult things -- jenna: if i could, anne, even considering that very dynamic past if that is, indeed, the case, and we showed a little bit of the interview with the teacher, people go through that, and not everyone becomes a terrorist. so what would be the tipping point, if you will, for someone in a state, a mental state where there's ptsd or other side to, again, switch to terrorism?